Across
- 3. last phase in then lifecycle
- 7. third rock from the sun
- 8. first person to discover space
- 9. often called Earth's twin
Down
- 1. composite image of the core region
- 2. is the first planet from the sun
- 3. is a system of two stars that are gravitationally
- 4. smaller than a asteroid
- 5. bigger than a Meteoroids
- 6. the international astronomiclal union